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/*!
* csurf
* Copyright(c) 2011 Sencha Inc.
* Copyright(c) 2014 Jonathan Ong
* Copyright(c) 2014-2016 Douglas Christopher Wilson
* MIT Licensed
*/
'use strict'
/**
* Module dependencies.
*
@private
*/
var
Cookie
=
require
(
'cookie'
)
var
createError
=
require
(
'http-errors'
)
var
sign
=
require
(
'cookie-signature'
)
.
sign
var
Tokens
=
require
(
'csrf'
)
/**
* Module exports.
*
@public
*/
module
.
exports
=
csurf
/**
* CSRF protection middleware.
*
* This middleware adds a `req.csrfToken()` function to make a token
* which should be added to requests which mutate
* state, within a hidden form field, query-string etc. This
* token is validated against the visitor's session.
*
*
@param
{
Object
} options
*
@return
{
Function
} middleware
*
@public
*/
function
csurf
(
options
)
{
var
opts
=
options
||
{
}
// get cookie options
var
cookie
=
getCookieOptions
(
opts
.
cookie
)
// get session options
var
sessionKey
=
opts
.
sessionKey
||
'session'
// get value getter
var
value
=
opts
.
value
||
defaultValue
// token repo
var
tokens
=
new
Tokens
(
opts
)
// ignored methods
var
ignoreMethods
=
opts
.
ignoreMethods
===
undefined
?
[
'GET'
,
'HEAD'
,
'OPTIONS'
]
:
opts
.
ignoreMethods
if
(
!
Array
.
isArray
(
ignoreMethods
)
)
{
throw
new
TypeError
(
'option ignoreMethods must be an array'
)
}
// generate lookup
var
ignoreMethod
=
getIgnoredMethods
(
ignoreMethods
)
return
function
csrf
(
req
,
res
,
next
)
{
// validate the configuration against request
if
(
!
verifyConfiguration
(
req
,
sessionKey
,
cookie
)
)
{
return
next
(
new
Error
(
'misconfigured csrf'
)
)
}
// get the secret from the request
var
secret
=
getSecret
(
req
,
sessionKey
,
cookie
)
var
token
// lazy-load token getter
req
.
csrfToken
=
function
csrfToken
(
)
{
var
sec
=
!
cookie
?
getSecret
(
req
,
sessionKey
,
cookie
)
:
secret
// use cached token if secret has not changed
if
(
token
&&
sec
===
secret
)
{
return
token
}
// generate & set new secret
if
(
sec
===
undefined
)
{
sec
=
tokens
.
secretSync
(
)
setSecret
(
req
,
res
,
sessionKey
,
sec
,
cookie
)
}
// update changed secret
secret
=
sec
// create new token
token
=
tokens
.
create
(
secret
)
return
token
}
// generate & set secret
if
(
!
secret
)
{
secret
=
tokens
.
secretSync
(
)
setSecret
(
req
,
res
,
sessionKey
,
secret
,
cookie
)
}
// verify the incoming token
if
(
!
ignoreMethod
[
req
.
method
]
&&
!
tokens
.
verify
(
secret
,
value
(
req
)
)
)
{
return
next
(
createError
(
403
,
'invalid csrf token'
,
{
code
:
'EBADCSRFTOKEN'
}
)
)
}
next
(
)
}
}
/**
* Default value function, checking the `req.body`
* and `req.query` for the CSRF token.
*
*
@param
{
IncomingMessage
} req
*
@return
{
String
}
*
@api
private
*/
function
defaultValue
(
req
)
{
return
(
req
.
body
&&
req
.
body
.
_csrf
)
||
(
req
.
query
&&
req
.
query
.
_csrf
)
||
(
req
.
headers
[
'csrf-token'
]
)
||
(
req
.
headers
[
'xsrf-token'
]
)
||
(
req
.
headers
[
'x-csrf-token'
]
)
||
(
req
.
headers
[
'x-xsrf-token'
]
)
}
/**
* Get options for cookie.
*
*
@param
{
boolean|object
} [options]
*
@returns
{
object
}
*
@api
private
*/
function
getCookieOptions
(
options
)
{
if
(
options
!==
true
&&
typeof
options
!==
'object'
)
{
return
undefined
}
var
opts
=
{
key
:
'_csrf'
,
path
:
'/'
}
if
(
options
&&
typeof
options
===
'object'
)
{
for
(
var
prop
in
options
)
{
var
val
=
options
[
prop
]
if
(
val
!==
undefined
)
{
opts
[
prop
]
=
val
}
}
}
return
opts
}
/**
* Get a lookup of ignored methods.
*
*
@param
{
array
} methods
*
@returns
{
object
}
*
@api
private
*/
function
getIgnoredMethods
(
methods
)
{
var
obj
=
Object
.
create
(
null
)
for
(
var
i
=
0
;
i
<
methods
.
length
;
i
++
)
{
var
method
=
methods
[
i
]
.
toUpperCase
(
)
obj
[
method
]
=
true
}
return
obj
}
/**
* Get the token secret from the request.
*
*
@param
{
IncomingMessage
} req
*
@param
{
String
} sessionKey
*
@param
{
Object
} [cookie]
*
@api
private
*/
function
getSecret
(
req
,
sessionKey
,
cookie
)
{
// get the bag & key
var
bag
=
getSecretBag
(
req
,
sessionKey
,
cookie
)
var
key
=
cookie
?
cookie
.
key
:
'csrfSecret'
if
(
!
bag
)
{
/* istanbul ignore next: should never actually run */
throw
new
Error
(
'misconfigured csrf'
)
}
// return secret from bag
return
bag
[
key
]
}
/**
* Get the token secret bag from the request.
*
*
@param
{
IncomingMessage
} req
*
@param
{
String
} sessionKey
*
@param
{
Object
} [cookie]
*
@api
private
*/
function
getSecretBag
(
req
,
sessionKey
,
cookie
)
{
if
(
cookie
)
{
// get secret from cookie
var
cookieKey
=
cookie
.
signed
?
'signedCookies'
:
'cookies'
return
req
[
cookieKey
]
}
else
{
// get secret from session
return
req
[
sessionKey
]
}
}
/**
* Set a cookie on the HTTP response.
*
*
@param
{
OutgoingMessage
} res
*
@param
{
string
} name
*
@param
{
string
} val
*
@param
{
Object
} [options]
*
@api
private
*/
function
setCookie
(
res
,
name
,
val
,
options
)
{
var
data
=
Cookie
.
serialize
(
name
,
val
,
options
)
var
prev
=
res
.
getHeader
(
'set-cookie'
)
||
[
]
var
header
=
Array
.
isArray
(
prev
)
?
prev
.
concat
(
data
)
:
Array
.
isArray
(
data
)
?
[
prev
]
.
concat
(
data
)
:
[
prev
,
data
]
res
.
setHeader
(
'set-cookie'
,
header
)
}
/**
* Set the token secret on the request.
*
*
@param
{
IncomingMessage
} req
*
@param
{
OutgoingMessage
} res
*
@param
{
string
} sessionKey
*
@param
{
string
} val
*
@param
{
Object
} [cookie]
*
@api
private
*/
function
setSecret
(
req
,
res
,
sessionKey
,
val
,
cookie
)
{
if
(
cookie
)
{
// set secret on cookie
var
value
=
val
if
(
cookie
.
signed
)
{
var
secret
=
req
.
secret
if
(
!
secret
)
{
/* istanbul ignore next: should never actually run */
throw
new
Error
(
'misconfigured csrf'
)
}
value
=
's:'
+
sign
(
val
,
secret
)
}
setCookie
(
res
,
cookie
.
key
,
value
,
cookie
)
}
else
if
(
req
[
sessionKey
]
)
{
// set secret on session
req
[
sessionKey
]
.
csrfSecret
=
val
}
else
{
/* istanbul ignore next: should never actually run */
throw
new
Error
(
'misconfigured csrf'
)
}
}
/**
* Verify the configuration against the request.
*
@private
*/
function
verifyConfiguration
(
req
,
sessionKey
,
cookie
)
{
if
(
!
getSecretBag
(
req
,
sessionKey
,
cookie
)
)
{
return
false
}
if
(
cookie
&&
cookie
.
signed
&&
!
req
.
secret
)
{
return
false
}
return
true
}
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